/*
 * Copyright [2020] [MaxKey of copyright http://www.maxkey.top]
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 

package org.maxkey.client.oauth.services;

public abstract class Base64Encoder
{
  private static Base64Encoder instance;

  public static synchronized Base64Encoder getInstance()
  {
    if (instance == null)
    {
      instance = createEncoderInstance();
    }
    return instance;
  }

  private static Base64Encoder createEncoderInstance()
  {
    if (CommonsEncoder.isPresent())
    {
      return new CommonsEncoder();
    }
    else
    {
      return new DatatypeConverterEncoder();
    }
  }

  public static String type()
  {
    return getInstance().getType();
  }

  public abstract String encode(byte[] bytes);

  public abstract String getType();
}
